More Than Two External Editors in LR CC?

Merged

Can I have more than two external editors set up in LR CC? Several of the Topaz plugins will only operate as standalone apps. Their solution is to set the ones that can't be used as true plugins as external editors. But it appears to me that LR only permits two external editors when navigating from the Photo>Edit In... dropdown menu. I'd like to be able to select any of the standalone apps from that dropdown, but it appears that if limited to only two external editors, I would have to install-delete and reinstall another app to get that functionality.